Underreamer



W. C.v CUTLER.

UNDERREAMER.

APPLICATION FILED IAN. I2, 1920.

1,358,299, PatenIeaNov. 9,1920.-

WILLIAM o. cu'rnnn, or NORTH GLEND'ALE, cALrronNrA.

UNDERREAMER.

Specification of Letters Patent. Ptnted NGV, 9, 192Q Application ledJanuary 12, 1920. Serial No. 350,759..

To @ZZ 2li/wm 'it may concern.'

Be it known that l, rl/Timmer C. CUrLnn, a citizen of the United States,residing at North Glendale, in the county of Los Angeles and State oitCalifornia, have invented a new and useful Underreamer, of which the:tollcmfbng` isa speciiioation. y

This invention relates to devices for. underreaming a well below thecasing in the well.

@ne or the objects ot this invention is to provide a simple but strongtool.

another object 1s to solidly connect the center supporting bar to theybody of the device.

Another object is to have the roaming members oscillate around a iXedpoint within the body without havinp` to use a pin for the pivot.

,.flnother object is to facilitate the assemblingof the whole device.

Another object is to arrange all removable parts so that they can beassembled andV in such assembled condition be disposed into the bodyjust requiring the insertion of a cross pin for operativelyinterconnecting the assembled parts with the body of the device.

@ther objects will appear from the following description and appendedclaims as well as from the accompanyinp,- drawing, in which y y Figure 1is a longitudinal sectional View through the operating portion ot thedevice. Fig'. 2 is a cross section on line 2-2 of lfio. 1.

Similar numbers reiter to similar parts throughout the several views.

rllhe body 3 is provided with a concentric bore 4 from the lower endupwardly to a suitable point, and with a cross bore 5. A supporting barG is provided with a collar or head 7, which fits into the bore 4. Thecross bore 8 in the head 7 of the supporting bar G is designed to comeinto alinement with the cross bore 5 in the body 3 for the pin 9. By thepin 9, the supporting bar is solidly connected to the body, the head 7fitting in the bore 4 so as to hold the bar 6 in such a concentricposition within the bore 4 ofthe body 3 as to form a good solidinterconnection between the body and the roaming memberslO and 11. Thelower end 12 of the supporting` bar is flattened to fit between theroaming members, and, near the lower termination of the flat end,provided with two bosses 13 to engage in corresponding recesses of theroaming members. A washer lby the action of the spring 15. p

The faces 20 of the roaming members 14 is disposed abovel thereamingmembers within the bore 4 oit the body to form a locking ring 16is disposed above the spring,` 15 resting' against the head 7 of thesupport- Y ing bar 6. The wedge-shaped circular bead or upwardlyprojecting portion 17 engages in the correspondingly shaped circulargroove 18 in the head 7, and, when the pin 9 is in engaging' andinterlocking position within the bore 5 of the body and thel bore 8 ofthe head, the wedgeeshaped bead also engages with the notches 19 in thepin 9 thereby locking thepin 9 within the device and interlocking` thewhole device, as will easily be understood.

ln assembling the device, the ring 16 is first disposed on thesupporting bar 6 against the head 7, then the spring 15 is disposed onthe supporting bar against the ring 16, then the. washer is disposed onthe supporting bar against the lower end of the spring, and then theroaming members `10 and 11 are engaged over the bosses 13 by theirrecesses. rJ'his whole arrangement is so der signed that the severalparts will stay so intereng'aged to be pushed into the bore 4 oi thebody to a point that the pin 9 can be disposed througdi the cross boresinto its correct interlocking position for interlocking the wholedevice. i

lVhen so interloclred, the roaming menibers are free to oscillate around`the bosses 13, operated back to their operative positiontouch oneanother free enough `for the oscillating movement of thev rearningmembers. These faces are at practically right angles to the cuttingedges 21 of the reaming members. Becesses 22 are provided within thefaces 2l) to allow the iiattened end 12 to come between the rean'iingmembers. The smaller recesses 13 are then naturally within the recesses22 for the bosses on the supportH ing bar as will easily be understood.The faces 23 are at practically right angles to the central faces 20,taking up the side pres sure during the reaming` process in a well. Theilattened portion 12 of the supporting` bar 6 naturally also tends toresist the side pressure of the roaming members during such roaming'operations.l

The solid interconnection of the supportw ing bar with the body isintended to make the flattened end 12'with the bosses practically apartofthe body so as to produce a direct operative action of the reamingmembers in relation to the body, that is a Hdirect oscillating` movementbelow and within-the body, the point ot oscillation always remaining atthe same point inexpanded as well as collapsed position 'ot the reaming`members during the operative actions of the reaming members in relationto the body.

vrEhe spring` acts duringl such operative ac-V tions oi the Teaming'members on the top end 24 of the counter levers ot the roaming,`members, pressingthese levers downwardly and thereby bringing' therea-ming` members, that is the cutting edges ot the reaming inembers, upto the expanded position in which Y thel are illustrated in Fie'. l.rl`he reamino t; 23

Van

members are thus always automatically pressed to thelower end ot thebody in enpanded operative position.

l-laving` thus described my invention,

. claim:

l. ln `an underreamer, a body having` a concentric bore from the lowerend inwardly and having a cross boreat a point near the innertermination ot the concentric bore,

. a supporting bar having ahead iitting in the concentric bore of thebody and having a cross bore through the head adapted to having means toengage with the lower end of the supporting bar for oscillating movementon the supporting` ba1 inrelation to the body so as to extend beyond theperiphery ot the body inoperative position adapted for collapsing withinthe periphery ot' the body, a spring inserted between the head ot thesupporting bar and thetop ot Ythereaming` members surrounding thesupporting bar adapted to press on the top of the reaming members torholding` the reamingv members in operative position in relation to thebody, a pin inserted through the cross bores oi the body and supportingbar having notches in its sides, and a locking` ring,` disposed on thesupporting bai-resting against the head ot the supporting bar havingcorresponding projections to engage with the notches in the pin, theinterengaging ot the pin and the locking ring adapted to interlock thewhole device.

2. ln anunderreamer, a supporting bar having` a cylindrical head-oi alarger diameter `than the bar itself near one end and hav ing aV4liattened portion near the opposite end, theflattened portion having`bosses termed thereon projecting laterally from the bar, the cylindricalhead forming the engaging means of the bar for solidly engaging withinareamer.

3. ln an underreamer, a body having a concentric and cylindrical bore, asupporting bar having 'a cylindrical head of alarger diameter than thebar itself fitting in the bore 01"' the body and having means solidlyengaging the bar with the body and having other means forming thestationary pivot points o'l the body though such solid interconnectionbetween the bar and the body, roaming members swingably engaging withsaid pivots in operative relation to the body, and a spring' insertedinto the body above the roaming` members adapted to press on the topsoil the reaming members for holding the roamingmembers in operativeposition. ln testimony that l claim the foregoing asmyinvention I havesigned my naine in the presence of' two subscribing witnesses.

WILLIAM Q CUTLER.

Witnesses HERMAN NELSON, C. L. MORRISON.

